package com.bigtotoro.util.image;


import android.annotation.TargetApi;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.nfc.Tag;
import android.os.Build;
import android.util.Log;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * 图片压缩
 */
public class BitmapHelper {
    private static String TAG = "BitmapHelper";

    /**
     * 按质量压缩, 一般性先按照比例压缩，再按照质量压缩, 30不会失真
     * @param image
     * @return
     */
    public static Bitmap compressImage(Bitmap image) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 30, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
//        int options = 60;
//        while ( baos.toByteArray().length / 1024>100) {	//循环判断如果压缩后图片是否大于200kb,大于继续压缩
//            baos.reset();//重置baos即清空baos
//            image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
//            options -= 10;//每次都减少10
//        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
        return bitmap;
    }

    /**
     * 图片按比例大小压缩方法（根据路径获取图片并压缩）
     * @param srcPath
     * @return
     */
    public static Bitmap getimage(String srcPath, int maxWidth, int maxHeight) {
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        //开始读入图片，此时把options.inJustDecodeBounds 设回true了
        newOpts.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeFile(srcPath,newOpts);//此时返回bm为空

        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
        float hh = maxHeight;//这里设置高度为800f
        float ww = maxWidth;//这里设置宽度为480f
        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
        int be = 1;//be=1表示不缩放
        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
            be = (int) (newOpts.outWidth / ww);
        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
            be = (int) (newOpts.outHeight / hh);
        }
        if (be <= 0)
            be = 1;
        newOpts.inSampleSize = be;//设置缩放比例
        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
        bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
    }

    /**
     * 图片按比例大小压缩方法（根据Bitmap图片压缩）
     * @param image
     * @return
     */
    private Bitmap comp(Bitmap image, int maxWidth, int maxHeight) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        if( baos.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出
            baos.reset();//重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%，把压缩后的数据存放到baos中
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        //开始读入图片，此时把options.inJustDecodeBounds 设回true了
        newOpts.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
        float hh = maxHeight;//这里设置高度为800f
        float ww = maxWidth;//这里设置宽度为480f
        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
        int be = 1;//be=1表示不缩放
        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
            be = (int) (newOpts.outWidth / ww);
        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
            be = (int) (newOpts.outHeight / hh);
        }
        if (be <= 0)
            be = 1;
        newOpts.inSampleSize = be;//设置缩放比例
        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
        isBm = new ByteArrayInputStream(baos.toByteArray());
        bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
    }

    public static Bitmap scaleAndCompress(String path, int maxWidth, int maxHeight) {
        Bitmap image = getimage(path,maxWidth,maxHeight);
        return compressImage(image);
    }

    // ---------- OTHER
    public static Bitmap getSmallBitmap(String filePath, int maxWidth, int maxHeight) {

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, 480, 800);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;

        Bitmap bm = BitmapFactory.decodeFile(filePath, options);
        if(bm == null){
            return  null;
        }
        int degree = readPictureDegree(filePath);
        bm = rotateBitmap(bm,degree) ;
        ByteArrayOutputStream baos = null ;
        try{
//            baos = new ByteArrayOutputStream();
//            bm.compress(Bitmap.CompressFormat.JPEG, 30, baos);
            byte[] data = compressBitmap(bm, 100);

            ByteArrayInputStream isBm = new ByteArrayInputStream(data);//把压缩后的数据baos存放到ByteArrayInputStream中
            return BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片

        }finally{
            try {
                if(baos != null)
                    baos.close() ;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    private static int calculateInSampleSize(BitmapFactory.Options options,
                                             int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            // Calculate ratios of height and width to requested height and
            // width
            final int heightRatio = Math.round((float) height
                    / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will
            // guarantee
            // a final image with both dimensions larger than or equal to the
            // requested height and width.
            inSampleSize = heightRatio < widthRatio ? widthRatio : heightRatio;
        }

        return inSampleSize;
    }

    private static Bitmap rotateBitmap(Bitmap bitmap, int rotate){
        if(bitmap == null)
            return null ;

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        // Setting post rotate to 90
        Matrix mtx = new Matrix();
        mtx.postRotate(rotate);
        return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
    }
    private static int readPictureDegree(String path) {
        int degree  = 0;
        try {
            ExifInterface exifInterface = new ExifInterface(path);
            int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
            switch (orientation) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    degree = 90;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    degree = 180;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    degree = 270;
                    break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return degree;
    }

    public static byte[] compressBitmap(Bitmap bitmap,float size){
        if(bitmap==null||getSizeOfBitmap(bitmap)<=size){
            return null;//如果图片本身的大小已经小于这个大小了，就没必要进行压缩
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);//如果签名是png的话，则不管quality是多少，都不会进行质量的压缩
        int quality=100;
        while (baos.toByteArray().length / 1024f>size) {
            quality=quality-4;// 每次都减少4
            baos.reset();// 重置baos即清空baos
            if(quality<=0){
                break;
            }
            bitmap.compress(Bitmap.CompressFormat.JPEG, quality, baos);
            Log.d(TAG, "------质量--------" + baos.toByteArray().length / 1024f);
        }
        return baos.toByteArray();
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
    protected static int getSizeOfBitmap(Bitmap data) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) {
            return data.getRowBytes() * data.getHeight();
        } else {
            return data.getByteCount();
        }
    }
}